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Do you have a tap you can run thru the holes? The seat belt bolts to nots seem quite a precise fit for obvious reasons I guess. I typically find the right thread then run the appropriate tapping tool through to clean the threads up as they are usually a bit corroded and also it does not take much to bet them splayed a bit and tight to get in. Also use a smidge of anti seize or even straight oil, makes a big difference and wont negatively affect the load rating.